CN105550740A - Non-contact IC (Integrated Circuit) card and operation method thereof, and card reader and card reading method thereof - Google Patents
Non-contact IC (Integrated Circuit) card and operation method thereof, and card reader and card reading method thereof Download PDFInfo
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- CN105550740A CN105550740A CN201510982990.8A CN201510982990A CN105550740A CN 105550740 A CN105550740 A CN 105550740A CN 201510982990 A CN201510982990 A CN 201510982990A CN 105550740 A CN105550740 A CN 105550740A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07745—Mounting details of integrated circuit chips
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- Near-Field Transmission Systems (AREA)
- Credit Cards Or The Like (AREA)
Abstract
The invention provides a non-contact IC (Integrated Circuit) card and an operation method thereof. The operation method of the non-contact IC card comprises the following steps of collecting a first voltage signal generated by external signal motivation; demodulating the first voltage signal, and obtaining a demodulation signal; according to the demodulation signal, generating a first modulation signal, and generating a corresponding second modulation signal according to a relationship between the first voltage signal and a preset signal; and modulating the first modulation signal and the second modulation signal to a second voltage signal to form a feedback signal. The non-contact IC card and the operation method of the non-contact IC card can effectively protect information in the card, and improve the safety of the IC card. The invention also provides a card reader and a card reading method.
Description
Technical field
The present invention relates to integrated circuit card (IC-card) field, specifically, the present invention relates to a kind of non-contact IC card and How It Works, card reader and card reading method thereof.
Background technology
Integrated circuit is packaged with, in order to Storage and Processing data in integrated circuit (IntegratedCircuit, IC) card.Since IC-card is born, experienced by and snapped into smart card, evolution from Contact Type Ic Card to contactless IC card from storing.Contactless IC card, also known as radio-frequency card, is the new technology grown up recent years in the world.Contactless IC card is made up of IC chip, antenna, and the IC chip antenna built-in with contactless IC card is connected, and is encapsulated in the PVC card sheet of a standard.Adopt non-contact IC technology, contactless ic is stuck in certain distance scope near read write line (being generally the read write line possessing and IC-card is write to data) surface, is completed the read-write operation of data by electromagnetic transmission.When read write line carries out read-write operation to contactless IC card, read write line sends electromagnetic signal, radio frequency (the RadioFrequency of contactless IC card, RF) interface circuit detects the electromagnetic signal that read write line sends, and is exchanged under the control of IC chip by RF interface circuit and read write line settling signal.Traditional non-contact IC card is easily powerful by Partial Power or have the illegal read-write card internal information of card reader of special card-reading function, and serious harm card internal information, security has much room for improvement.
Summary of the invention
Object of the present invention is intended at least to solve the not high technological deficiency of one of above-mentioned technological deficiency, particularly security.
The invention provides a kind of non-contact IC card How It Works, comprise the steps:
The first voltage signal that collection is encouraged by external signal and produces;
Described first voltage signal demodulation is obtained restituted signal;
Generate the first modulation signal according to described restituted signal, produce the second corresponding modulation signal according to described first voltage signal to the relation of preset signals;
First modulation signal and the second modulation signal are modulated to the second voltage signal and form feedback signal.
In the present invention, produce the second corresponding modulation signal according to the described magnitude of voltage of the first voltage signal to the relation of the magnitude of voltage of preset signals.
In the present invention, describedly produce the second corresponding modulation signal according to the described magnitude of voltage of the first voltage signal to the relation of the magnitude of voltage of preset signals and be:
Judge whether the difference of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce corresponding second modulation signal.
In the present invention, comprise more than one setting voltage threshold value, each setting voltage threshold value has corresponding second modulation signal.
In the present invention, produce the second random modulation signal according to the relation of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals.
In the present invention, the described relation according to the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals and produce the second random modulation signal and be:
Judge whether the difference of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce the second random modulation signal.
In the present invention, described second modulation signal has the signature identification of setting.
In the present invention, described second modulation signal has the characteristic frequency of setting.
In the present invention, encouraged by external signal and before the first voltage signal of producing, also rectification is carried out to described first voltage signal gathering.
In the present invention, gather and encouraged by external signal and before the first voltage signal produced, also comprise step:
Under extraneous switch triggering event triggers, make non-contact IC card form the loop that can be energized.
The present invention also provides a kind of non-contact IC card, comprising:
Acquisition module, is encouraged by external signal and the first voltage signal produced for gathering;
Demodulation module, for obtaining restituted signal by described first voltage signal demodulation;
Processing module, for generating the first modulation signal according to described restituted signal, produces the second corresponding modulation signal according to described first voltage signal to the relation of preset signals; And
Modulation module, forms feedback signal for the first modulation signal and the second modulation signal being modulated to the second voltage signal.
In the present invention, described processing module produces the second corresponding modulation signal according to the described magnitude of voltage of the first voltage signal to the relation of the magnitude of voltage of preset signals.
In the present invention, describedly produce the second corresponding modulation signal according to the described magnitude of voltage of the first voltage signal to the relation of the magnitude of voltage of preset signals and be:
Judge whether the difference of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce corresponding second modulation signal.
In the present invention, comprise more than one setting voltage threshold value, each setting voltage threshold value has corresponding second modulation signal.
In the present invention, described processing module produces the second random modulation signal according to the relation of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals.
In the present invention, the described relation according to the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals and produce the second random modulation signal and be:
Judge whether the difference of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce the second random modulation signal.
In the present invention, described second modulation signal has the signature identification of setting.
In the present invention, described second modulation signal has the characteristic frequency of setting.
In the present invention, also comprise rectification module; To be encouraged by external signal in described sampling module collection and before the first voltage signal produced, described rectification module also carries out rectification to described first voltage signal.
In the present invention, also comprise switch module; Described switch module makes non-contact IC card form the loop that can be energized under extraneous switch triggering event triggers.
In the present invention, also comprise Anneta module, described Anneta module is encouraged by external signal and produces the first voltage signal.
In the present invention, feedback signal also sends by described Anneta module.
The present invention also provides a kind of card reading method, comprises the steps:
Receive the feedback signal that non-contact IC card sends; Described feedback signal comprises the first modulation signal and the second modulation signal that described non-contact IC card is modulated to the second voltage signal;
Described feedback signal demodulation is obtained the first restituted signal and the second restituted signal; Described first restituted signal and the second restituted signal be corresponding described first modulation signal and the second modulation signal respectively.
In the present invention, described second restituted signal has the signature identification of setting, and by identifying this signature identification, demodulation obtains described second restituted signal.
In the present invention, described second modulation signal has the characteristic frequency of setting, and by identifying this characteristic frequency, demodulation obtains described second restituted signal.
The present invention also provides a kind of card reader, comprising:
Anneta module, for receiving the feedback signal that non-contact IC card sends; Described feedback signal comprises the first modulation signal and the second modulation signal that described non-contact IC card is modulated to the second voltage signal; And
Demodulation module, for obtaining the first restituted signal and the second restituted signal by described feedback signal demodulation; Described first restituted signal and the second restituted signal be corresponding described first modulation signal and the second modulation signal respectively.
In the present invention, described second restituted signal has the signature identification of setting, and by identifying this signature identification, demodulation obtains described second restituted signal to described demodulation module.
In the present invention, described second modulation signal has the characteristic frequency of setting, and by identifying this characteristic frequency, demodulation obtains described second restituted signal to described demodulation module.
Above-mentioned non-contact IC card and How It Works thereof, gather and encouraged by external signal and the first voltage signal produced; Described first voltage signal demodulation is obtained restituted signal; Generate the first modulation signal according to described restituted signal, produce the second corresponding modulation signal according to described first voltage signal to the relation of preset signals; First modulation signal and the second modulation signal are modulated to the second voltage signal and form feedback signal.By introducing the second modulation signal formed according to described first voltage signal in feedback signal, and the second modulation signal is mixed the first modulation signal and be modulated to the second voltage signal by Anneta module and send; The Card Reader signal of illegal card reader is owing to effectively cannot control the magnitude of voltage of the first voltage signal that IC-card receives apart from reason, therefore the first voltage signal and preset signals do not mate the formation that will trigger the second modulation signal; What read due to illegal card reader is the mixed signal of the first modulation signal and the second modulation signal, do not obtaining in specific separation method situation, first modulation signal cannot be separated with the second modulation signal, thus the first actual useful modulation signal cannot be extracted.Here, the second modulation signal can be interpreted as a kind of scrambled signals.This non-contact IC card and How It Works thereof can available protecting card internal informations, improve IC-card security.
Above-mentioned card reader and card reading method thereof, receive the feedback signal that non-contact IC card sends; Described feedback signal comprises the first modulation signal and the second modulation signal that described non-contact IC card is modulated to the second voltage signal; Described feedback signal demodulation is obtained the first restituted signal and the second restituted signal; Described first restituted signal and the second restituted signal be corresponding described first modulation signal and the second modulation signal respectively.Can be separated by the separation method (such as by recognition feature mark, characteristic frequency) preset the first restituted signal and the second restituted signal that obtain corresponding first modulation signal and the second modulation signal respectively, thus the interference that can filter out the second modulation signal obtains the first useful modulation signal.
The aspect that the present invention adds and advantage will part provide in the following description, and these will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is an embodiment non-contact IC card module diagram;
Fig. 2 is an embodiment rectification module schematic diagram;
Fig. 3 is an embodiment modulation module schematic diagram;
Fig. 4 is an embodiment non-contact IC card How It Works process flow diagram;
Fig. 5 be an embodiment non-contact IC card and card reader mutual time module diagram;
Fig. 6 is an embodiment demodulation module schematic diagram;
Fig. 7 is an embodiment card reader module schematic diagram;
Fig. 8 is an embodiment card reading method process flow diagram.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Those skilled in the art of the present technique are appreciated that unless expressly stated, and singulative used herein " ", " one ", " described " and " being somebody's turn to do " also can comprise plural form.Should be further understood that, the wording used in instructions of the present invention " comprises " and refers to there is described feature, integer, step, operation, element and/or assembly, but does not get rid of and exist or add other features one or more, integer, step, operation, element, assembly and/or their group.Should be appreciated that, when we claim element to be " connected " or " coupling " to another element time, it can be directly connected or coupled to other elements, or also can there is intermediary element.In addition, " connection " used herein or " coupling " can comprise wireless connections or wirelessly to couple.Wording "and/or" used herein comprises one or more whole or arbitrary unit listing item be associated and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprising technical term and scientific terminology), have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.It should also be understood that, those terms defined in such as general dictionary, should be understood to that there is the meaning consistent with the meaning in the context of prior art, unless and by specific definitions as here, otherwise can not explain by idealized or too formal implication.
Those skilled in the art of the present technique are appreciated that, here used " terminal ", " terminal device " had both comprised the equipment of wireless signal receiver, it only possesses the equipment of the wireless signal receiver without emissive ability, comprise again the equipment receiving and launch hardware, it has and on bidirectional communication link, can perform the reception of two-way communication and launch the equipment of hardware.This equipment can comprise: honeycomb or other communication facilitiess, its honeycomb or other communication facilities of having single line display or multi-line display or not having multi-line display; PCS (PersonalCommunicationsService, PCS Personal Communications System), it can combine voice, data processing, fax and/or its communication ability; PDA (PersonalDigitalAssistant, personal digital assistant), it can comprise radio frequency receiver, pager, the Internet/intranet access, web browser, notepad, calendar and/or GPS (GlobalPositioningSystem, GPS) receiver; Conventional laptop and/or palmtop computer or other equipment, it has and/or comprises the conventional laptop of radio frequency receiver and/or palmtop computer or other equipment.Here used " terminal ", " terminal device " can be portable, can transport, be arranged in the vehicles (aviation, sea-freight and/or land), or be suitable for and/or be configured at local runtime, and/or with distribution form, any other position operating in the earth and/or space is run.Here used " terminal ", " terminal device " can also be communication terminal, access terminals, music/video playback terminal, can be such as PDA, MID (MobileInternetDevice, mobile internet device) and/or there is the mobile phone of music/video playing function, also can be the equipment such as intelligent television, Set Top Box.
Those skilled in the art of the present technique are appreciated that used remote network devices here, and it includes but not limited to the cloud that computing machine, network host, single network server, multiple webserver collection or multiple server are formed.At this, cloud is formed by based on a large amount of computing machine of cloud computing (CloudComputing) or the webserver, and wherein, cloud computing is the one of Distributed Calculation, the super virtual machine be made up of a group loosely-coupled computing machine collection.In embodiments of the invention, realize communicating by any communication mode between remote network devices, terminal device with WNS server, include but not limited to, the mobile communication based on 3GPP, LTE, WIMAX, the computer network communication based on TCP/IP, udp protocol and the low coverage wireless transmission method based on bluetooth, Infrared Transmission standard.
Fig. 1 is an embodiment non-contact IC card module diagram, a kind of non-contact IC card is below described, it comprises: Anneta module 100, rectification module 200, acquisition module 300, demodulation module 400, processing module 500, modulation module 600, and Clock Extraction module and electrification reset module (not shown).
The first voltage signal U1 (being such as the aerial signal of 13.56MHZ) that Anneta module 100 produces for being encouraged by external signal.Anneta module 100 can comprise aerial coil, the electrostatic coupling antenna of such as non-contact type.Under the excitation of outside field signal, Anneta module 100 produces corresponding current signal, and forms corresponding first voltage signal U1.
Fig. 2 is an embodiment rectification module schematic diagram.Incorporated by reference to Fig. 1.
Rectification module 200 carries out rectification for the first voltage signal U1 produced being encouraged by external signal.Rectification module 200 can comprise full-wave rectifying circuit, such as, utilize the bridge rectifier circuit that multiple gate-controlled switch realizes, and gate-controlled switch can adopt field effect transistor.Can transistor for N-type field effect, bridge rectifier circuit can comprise the first field effect can transistor M1, second field effect can transistor M2, 3rd field effect can transistor M3, 4th field effect can transistor M4, when when ANT1 is high level, ANT2 is low level, first field effect can be opened by transistor M3 in transistor M1 and the 3rd field effect, second field effect can end by transistor M4 in transistor M2 and the 4th field effect, the voltage of ANT2 can discharge by transistor M1 by the first field effect, ANT1 can produce voltage by transistor M3 by the 3rd field effect, when when ANT1 is low level, ANT2 is high level, second field effect can be opened by transistor M4 in transistor M2 and the 4th field effect, first field effect can end by transistor M3 in transistor M1 and the 3rd field effect, the voltage of ANT1 can discharge by transistor M2 by the second field effect, and ANT2 can produce voltage by transistor M4 by the 4th field effect, thus realize rectification.
Acquisition module 300 is encouraged by external signal and the first voltage signal U1 rectified through rectification module 200 produced for gathering.Acquisition module 300 can comprise voltage detecting circuit, to detect the first rectified voltage signal U1, and obtains the magnitude of voltage V1 of the first voltage signal U1.The magnitude of voltage V1 of the first voltage signal U1 is transferred to processing module 500 by acquisition module.
Demodulation module 400 is for obtaining restituted signal RX by the first voltage signal U1 demodulation.Demodulator circuit can comprise envelope detection circuit to carry out detection to the first voltage signal U1, and the shaping then through shaping circuit exports, and completes the demodulation to the first voltage signal U1.Restituted signal RX is transferred to processing module 500 by demodulation module 400.
Processing module 500, for generating the first modulation signal TX1 according to restituted signal, produces the second corresponding modulation signal TX2 according to the first voltage signal U1 to the relation of preset signals.Processing module 500 comprises digital control circuit (numerical portion), for completing the process to restituted signal RX, and generates the first modulation signal TX1 and the second modulation signal TX2 according to restituted signal RX and the first voltage signal U1.The output signal VOUT that carrier signal (the second voltage signal U2), the first modulation signal TX1 and the second modulation signal TX2 form is transferred to modulation module 600 by processing module 500.
Fig. 3 is an embodiment modulation module schematic diagram.
Modulation module 600 forms feedback signal for the first modulation signal TX1 and the second modulation signal TX2 being modulated to the second voltage signal U2.Modulation module 600 can comprise modulation circuit, and modulation circuit can comprise field effect transistor M 5, field effect transistor M 6, field effect transistor M 7, and annexation is shown in Fig. 3.
First the carrier wave (i.e. the second voltage signal U2) being similarly 13.56MHZ is carried out 16 frequency divisions and obtains the subcarrier that frequency is 847KHZ by the numerical portion (processing module 500) of IC-card, and will the data (i.e. the first modulation signal TX1 and the second modulation signal TX2) sent be needed to carry out Manchester's cde, its transfer rate is 106kb/s, time shared by a data is 9.4 delicate, then modulation module 600 data of encoded mistake remove modulating subcarrier, switching on and off again with the subcarrier control load switch after modulation, the carrier wave of 13.56MHZ is modulated, form final output.
Clock Extraction module is used for extracting from the first voltage signal U1 (being such as the aerial signal of 13.56MHZ) that Anneta module 100 produces for whole contactless IC card system (such as processing module 500) provides the clock signal of clock.Clock Extraction module can comprise clock extracting circuit, and clock extracting circuit generally includes field effect transistor, latch and phase inverter.
Electrification reset module is used for carrying out electrification reset to processing module 500.When card reader carries out the operations such as read-write to IC-card, may be there is the accumulation of electric charge in the numerical portion (processing module 500) of IC-card, be in a kind of unsure state, so when powering at every turn, IC-card all will produce a reset signal, to eliminate this unsure state.
Non-contact IC card can also comprise switch module 700, and switch module 700 makes non-contact IC card form the loop that can be energized under extraneous switch triggering event triggers.Switch module 700 can be mechanical switch also can be electric-controlled switch, such as, can be soft-touch control.Anneta module 100, rectification module 200, acquisition module 300, demodulation module 400, processing module 500, modulation module 600, Clock Extraction module and electrification reset module generation can be energized loop, and the switch-linear hybrid of switch module 700 is in being energized on the main circuit of loop.When the switch is closed, the loop that can be energized is the loop (i.e. loop can On current) being in connection; When the switches are opened, the loop that can be energized is the loop (i.e. loop can not On current) being in disconnection.Therefore, when IC-card user needs to use IC-card, can touch make IC-card be in loop by the switch of switch module 700 can conducting state, thus IC-card is in state of activation (Anneta module 100 produces voltage signal) and carries out data interaction when being in magnetic field near card reader; When IC-card user does not need to use IC-card, do not go to touch the switch by switch module 700, make IC-card be in loop off-state, even if IC-card also cannot activate when card reader is in magnetic field, thus data security in protection card.
Describe a kind of non-contact IC card How It Works below in conjunction with above-mentioned non-contact IC card, Fig. 4 is an embodiment non-contact IC card How It Works process flow diagram.
A kind of non-contact IC card How It Works, comprises the steps:
Step S110: Anneta module 100 is encouraged by external signal and produces the first voltage signal U1.
Fig. 5 be an embodiment non-contact IC card and card reader mutual time module diagram.
Anneta module 100 can be equivalent to resistance R2 and the inductance L 2 of series connection, when card reader sends extraneous electromagnetic signals to Anneta module 100, the electric current I 1 of the modulated card reader antenna 10 (being equivalent to resistance R1 and the inductance L 1 of series connection) of card reader, when the electric current I 1 by inductance L 1 changes, the magnetic field that can change around inductance L 1.When Anneta module 100 enters into the magnetic field of the change that inductance L 1 produces, the first voltage signal U1 can be produced in inductance L 2.Wherein the first voltage signal U1 is determined by the mutual inductance M between Anneta module 100 and card reader antenna 10 and electric current I 1, and electric current I 1 is larger, and the first voltage signal U1 is larger.Illegal card reader, owing to cannot directly know mutual inductance M, thus cannot know the first voltage signal U1, but it can by changing electric current I 1 thus the first voltage signal U1 be changed, and when the first voltage signal U1 is eligible, IC-card is just activated.
The first voltage signal U1 that inductance L 2 produces can change electric current I 2, electric current I 2 can be changed like this through the electric current I 1 that card reader is modulated, demodulation module 400 passes through the change of monitoring first voltage signal U1 or electric current I 2, just can obtain the signal that card reader sends.
Step S120: rectification module 200 also carries out rectification to described first voltage signal U1.Rectification module 200 can comprise bridge rectifier circuit, and this bridge rectifier circuit comprises the first field effect transistor M1, the second field effect transistor M2, the 3rd field effect transistor M3 and the 4th field effect transistor M4, refers to Fig. 2.
Step S130: acquisition module 300 gathers and encouraged by external signal and the first voltage signal U1 produced.In the present embodiment, acquisition module 300 gathers the first voltage signal U1 after rectification module 200 rectification.
Step S140: demodulation module 400 is by the first voltage signal U1 demodulation and obtain restituted signal RX.Fig. 6 is an embodiment demodulation module schematic diagram, demodulation module 400 can comprise demodulator circuit, this demodulator circuit comprises detecting circuit 410, low-pass filter circuit 420, high-pass filtering circuit 430, comparator circuit 440 and biasing circuit 450, VREF1 and VREF1 is respectively reference voltage.
Step S150: processing module 500 generates the first modulation signal TX1 according to restituted signal, produces the second corresponding modulation signal TX2 according to the first voltage signal U1 to the relation of preset signals.Preset signals is the voltage signal that Anneta module 100 produces under the legal excitation of legal card reader, by judging the relation of the first voltage signal U1 and preset signals, can judge whether the first voltage signal U1 that Anneta module 100 produces is produce under the legal excitation of legal card reader.This is because illegal card reader is usual and IC-card has one section of larger distance, if need active antenna module 100, emissive power (namely strengthening above-mentioned electric current I 1) must be strengthened under setpoint frequency, produce enough voltage to make Anneta module 100 and IC-card internal circuit is activated.Therefore, by judging the relation of the first voltage signal U1 and preset signals, can judge whether the first voltage signal U1 that Anneta module 100 produces is produce under the legal excitation of legal card reader.If produce under illegal excitation, then can produce corresponding second modulation signal TX2.
Such as, processing module 500 can produce the second corresponding modulation signal TX2 according to the magnitude of voltage V1 of the first voltage signal U1 to the relation of the magnitude of voltage of preset signals.Judge whether the difference of the magnitude of voltage V1 of the first voltage signal U1 and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce corresponding second modulation signal TX2.Setting threshold value whether is exceeded by the difference of the magnitude of voltage of the magnitude of voltage V1 and preset signals that judge the first voltage signal U1, can judge whether the first voltage signal U1 exceeds much (far beyond error range) than preset signals, thus can judge that the first voltage signal U1 may be by generation that illegal card reader encourages, and then corresponding second modulation signal TX2 can be produced.
Can arrange more than one setting voltage threshold value, each setting voltage threshold value has corresponding second modulation signal TX2.Multiple setting voltage threshold value such as can be set, be respectively setting voltage threshold value Us1, setting voltage threshold value Us2, setting voltage threshold value Us3 ... setting voltage threshold value UsN, respectively corresponding second modulation signal TX21, the second modulation signal TX22, the second modulation signal TX23 ... second modulation signal TX2N.The difference of the magnitude of voltage V1 of the first voltage signal U1 and the magnitude of voltage of preset signals exceedes setting voltage threshold value Us1, then produce the second modulation signal TX21; The difference of the magnitude of voltage V1 of the first voltage signal U1 and the magnitude of voltage of preset signals exceedes setting voltage threshold value Us2, then produce the second modulation signal TX22; The difference of the magnitude of voltage V1 of the first voltage signal U1 and the magnitude of voltage of preset signals exceedes setting voltage threshold value UsN, then produce the second modulation signal TX2N.
In order to improve the difficulty illegally read by illegal card reader further, processing module 500 can produce the second random modulation signal TX2 according to the relation of the magnitude of voltage of the magnitude of voltage V1 of the first voltage signal U1 and preset signals.Such as can judge whether the difference of the magnitude of voltage V1 of the first voltage signal U1 and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce the second random modulation signal TX2.Processing module 500 can by random function to generate the second random modulation signal TX2.
The second modulation signal TX2 that processing module 500 produces according to the relation of the first voltage signal U1 and preset signals can have the signature identification of setting, can identify the second modulation signal TX2 to make legal card reader according to the signature identification of setting.Such as, the second modulation signal TX2 has the characteristic frequency of setting, and legal card reader can obtain the first required modulation signal TX1 by filtering out the second modulation signal TX2 of the characteristic frequency of setting.
Step S160: the first modulation signal TX1 and the second modulation signal TX2 is modulated to the second voltage signal U2 and forms feedback signal by modulation module 600.After forming feedback signal, send and feed back signal to Anneta module 100.
First the carrier wave (i.e. the second voltage signal U2) being similarly 13.56MHZ is carried out 16 frequency divisions and obtains the subcarrier that frequency is 847KHZ by the numerical portion (processing module 500) of IC-card, and will the data (comprising the first modulation signal TX1 and the second modulation signal TX2) sent be needed to carry out Manchester's cde, its transfer rate is 106kb/s, time shared by a data is 9.4 delicate, then modulation module 600 data of encoded mistake remove modulating subcarrier, switching on and off again with the subcarrier control load switch after modulation, the carrier wave of 13.56MHZ is modulated, form final output.
Step S170: feedback signal sends by Anneta module 100.
Incorporated by reference to Fig. 5, Anneta module 100 can be equivalent to resistance R2 and the inductance L 2 of series connection, when Anneta module 100 sends feedback signal, Anneta module 100 changes load Z according to the feedback signal that modulation module 600 exports thus modulates the electric current I 2 flowing through inductance L 2, based on mutual inductance principle, induced electromotive force can be produced in card reader antenna 10 (being equivalent to resistance R1 and the inductance L 1 of series connection), and then change the electric current I 1 of card reader antenna 10, the detuner of card reader, by detecting the change of electric current I 1, can obtain the feedback signal that Anneta module 100 sends.
If non-contact IC card also comprises switch module 700, then gather and to be encouraged by external signal and before the first voltage signal U1 produced, also comprise step: under extraneous switch triggering event triggers, make non-contact IC card form the loop that can be energized, namely switch module 700 makes non-contact IC card form the loop that can be energized under extraneous switch triggering event triggers.
Below describe a kind of card reader, Fig. 7 is an embodiment card reader module schematic diagram.
A kind of card reader, comprising: Anneta module 10 and demodulation module 20.
The feedback signal that Anneta module 10 sends for receiving non-contact IC card.Feedback signal comprises the first modulation signal TX1 and the second modulation signal TX2 that non-contact IC card is modulated to the second voltage signal U2.
Demodulation module 20 is for obtaining the first restituted signal and the second restituted signal by feedback signal demodulation.First restituted signal and the second restituted signal corresponding first modulation signal TX1 and the second modulation signal TX2 respectively.Therefore, the first restituted signal of card reader is exactly the first modulation signal TX1 of IC-card, and the second restituted signal of card reader is exactly the second modulation signal TX2 of IC-card.Equally, the second restituted signal has the signature identification of setting, and by identifying this signature identification, demodulation obtains the second restituted signal to demodulation module.In the present embodiment, the second modulation signal TX2 has the characteristic frequency of setting, and by identifying this characteristic frequency, demodulation obtains the second restituted signal to demodulation module.Therefore, the second restituted signal can have the signature identification of setting, can identify the second modulation signal TX2 to make card reader according to the signature identification of setting.Such as, the second restituted signal has the characteristic frequency of setting, and card reader can obtain the first required restituted signal by filtering out the second restituted signal of the characteristic frequency of setting.
Above-mentioned non-contact IC card and How It Works thereof, gather and encouraged by external signal and the first voltage signal produced; Described first voltage signal demodulation is obtained restituted signal; Generate the first modulation signal according to described restituted signal, produce the second corresponding modulation signal according to described first voltage signal to the relation of preset signals; First modulation signal and the second modulation signal are modulated to the second voltage signal and form feedback signal.By introducing the second modulation signal formed according to described first voltage signal in feedback signal, and the second modulation signal is mixed the first modulation signal and be modulated to the second voltage signal by Anneta module and send; The Card Reader signal of illegal card reader is owing to effectively cannot control the magnitude of voltage of the first voltage signal that IC-card receives apart from reason, therefore the first voltage signal and preset signals do not mate the formation that will trigger the second modulation signal; What read due to illegal card reader is the mixed signal of the first modulation signal and the second modulation signal, do not obtaining in specific separation method situation, first modulation signal cannot be separated with the second modulation signal, thus the first actual useful modulation signal cannot be extracted.Here, the second modulation signal can be interpreted as a kind of scrambled signals.This non-contact IC card and How It Works thereof can available protecting card internal informations, improve IC-card security.
Describe a kind of card reading method below in conjunction with above-mentioned card reader, Fig. 8 is an embodiment card reading method process flow diagram.This card reading method comprises the steps:
Step S210: receive the feedback signal that non-contact IC card sends.Feedback signal comprises the first modulation signal TX1 and the second modulation signal TX2 that non-contact IC card is modulated to the second voltage signal.
Step S220: feedback signal demodulation is obtained the first restituted signal and the second restituted signal.First restituted signal and the second restituted signal corresponding first modulation signal TX1 and the second modulation signal TX2 respectively.Second restituted signal has the signature identification of setting, and by identifying this signature identification, demodulation obtains the second restituted signal.Such as, the second modulation signal TX2 has the characteristic frequency of setting, and by identifying this characteristic frequency, demodulation obtains the second restituted signal.
Above-mentioned card reader and card reading method thereof, receive the feedback signal that non-contact IC card sends; Described feedback signal comprises the first modulation signal and the second modulation signal that described non-contact IC card is modulated to the second voltage signal; Described feedback signal demodulation is obtained the first restituted signal and the second restituted signal; Described first restituted signal and the second restituted signal be corresponding described first modulation signal and the second modulation signal respectively.Can be separated by the separation method (such as by recognition feature mark, characteristic frequency) preset the first restituted signal and the second restituted signal that obtain corresponding first modulation signal and the second modulation signal respectively, thus the interference that can filter out the second modulation signal obtains the first useful modulation signal.
Although it should be understood that Fig. 4,8 process flow diagram in each step show successively according to the instruction of arrow, these steps are not that the inevitable order according to arrow instruction perform successively.Unless had explicitly bright herein, the order that the execution of these steps is strict limits, and it can perform with other order.And, step at least partially in Fig. 4,8 can comprise multiple sub-step or multiple stage, these sub-steps or stage are necessarily not complete at synchronization, but can perform in the different moment, its execution sequence does not also necessarily carry out successively, but can with other steps or the sub-step of other steps or performing in turn or alternately at least partially of stage.
The above is only some embodiments of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a non-contact IC card How It Works, is characterized in that, comprises the steps:
The first voltage signal that collection is encouraged by external signal and produces;
Described first voltage signal demodulation is obtained restituted signal;
Generate the first modulation signal according to described restituted signal, produce the second corresponding modulation signal according to described first voltage signal to the relation of preset signals;
First modulation signal and the second modulation signal are modulated to the second voltage signal and form feedback signal.
2. non-contact IC card How It Works according to claim 1, is characterized in that, produces the second corresponding modulation signal according to the described magnitude of voltage of the first voltage signal to the relation of the magnitude of voltage of preset signals.
3. non-contact IC card How It Works according to claim 2, is characterized in that, describedly produces the second corresponding modulation signal according to the described magnitude of voltage of the first voltage signal to the relation of the magnitude of voltage of preset signals and is:
Judge whether the difference of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce corresponding second modulation signal.
4. non-contact IC card How It Works according to claim 3, is characterized in that, comprises more than one setting voltage threshold value, and each setting voltage threshold value has corresponding second modulation signal.
5. non-contact IC card How It Works according to claim 1, is characterized in that, produces the second random modulation signal according to the relation of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals.
6. non-contact IC card How It Works according to claim 5, is characterized in that, the described relation according to the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals and produce the second random modulation signal and be:
Judge whether the difference of the described magnitude of voltage of the first voltage signal and the magnitude of voltage of preset signals exceedes setting voltage threshold value, if then produce the second random modulation signal.
7. non-contact IC card How It Works according to claim 1, is characterized in that, described second modulation signal has the signature identification of setting.
8. a non-contact IC card, is characterized in that, comprising:
Acquisition module, is encouraged by external signal and the first voltage signal produced for gathering;
Demodulation module, for obtaining restituted signal by described first voltage signal demodulation;
Processing module, for generating the first modulation signal according to described restituted signal, produces the second corresponding modulation signal according to described first voltage signal to the relation of preset signals; And
Modulation module, forms feedback signal for the first modulation signal and the second modulation signal being modulated to the second voltage signal.
9. a card reading method, is characterized in that, comprises the steps:
Receive the feedback signal that non-contact IC card sends; Described feedback signal comprises the first modulation signal and the second modulation signal that described non-contact IC card is modulated to the second voltage signal;
Described feedback signal demodulation is obtained the first restituted signal and the second restituted signal; Described first restituted signal and the second restituted signal be corresponding described first modulation signal and the second modulation signal respectively.
10. a card reader, is characterized in that, comprising:
Anneta module, for receiving the feedback signal that non-contact IC card sends; Described feedback signal comprises the first modulation signal and the second modulation signal that described non-contact IC card is modulated to the second voltage signal; And
Demodulation module, for obtaining the first restituted signal and the second restituted signal by described feedback signal demodulation; Described first restituted signal and the second restituted signal be corresponding described first modulation signal and the second modulation signal respectively.
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| CN111368568A (en) * | 2018-12-26 | 2020-07-03 | 紫光同芯微电子有限公司 | Novel non-contact high-speed demodulation circuit |
| CN111751706A (en) * | 2020-06-22 | 2020-10-09 | 江苏高聚识别技术有限公司 | Identity recognition technology research and development auxiliary system |
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| CN100525135C (en) * | 1999-09-22 | 2009-08-05 | 松下电器产业株式会社 | Non-contact type IC card preventing data from error restoring while AM wave-carrier demodulation |
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| CN100525135C (en) * | 1999-09-22 | 2009-08-05 | 松下电器产业株式会社 | Non-contact type IC card preventing data from error restoring while AM wave-carrier demodulation |
| US20060267734A1 (en) * | 2004-02-04 | 2006-11-30 | Brother Kogyo Kabushiki Kaisha | RFID-tag communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111368568A (en) * | 2018-12-26 | 2020-07-03 | 紫光同芯微电子有限公司 | Novel non-contact high-speed demodulation circuit |
| CN111751706A (en) * | 2020-06-22 | 2020-10-09 | 江苏高聚识别技术有限公司 | Identity recognition technology research and development auxiliary system |
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| CN105550740B (en) | 2018-09-25 |
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